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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7209a6ba6a2099a2c2514342921d8df131f49ac48b0d32c9df25a1e4d0ae2932' 
  AND token = 'E4QZC5VWe81iyz2cfN05IJL9fM1oWxtkUFQ58hATBxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}